Free-DC
10-12-2014, 05:02 PM
On 21 September 2014, 18:43:31 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=325918 by finding the mega prime: 325918*5^1803339-1 (http://primes.utm.edu/primes/page.php?id=118535) The prime is 1,260,486 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 58th overall. This is the largest known base 5 mega prime. 79 k's now remain in the Riesel Base 5 Problem. The discovery was made by Jörg Meili (meilijo (http://www.primegrid.com/show_user.php?userid=108587)) of Switzerland using an Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz with 8GB RAM running Microsoft Windows 7 Home Premium. This computer took about 20 hours and 51 minutes to complete the primality test using LLR. Jörg is a member of the Aggie the Pew (http://www.primegrid.com/team_display.php?teamid=2280) team. The prime was verified on 1 October 2014, 12:57:59 UTC by Yegor Ryabchikov (Yegor001 (http://www.primegrid.com/show_user.php?userid=112215)) of Russia using an Intel(R) Core(TM) i5 CPU 760 @ 2.80GHz with 2GB RAM running Microsoft Windows 7 Home Basic. This computer took about 133 hours 16 minutes to complete the primality test using LLR. For more details, please see the official announcement (http://www.primegrid.com/download/SR5-325918.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=5929)
More... (http://www.primegrid.com/forum_thread.php?id=5929)